Torque wrenches - Ambitex

6Torque wrenchesTorque control guideTorque controlTightening torque and tensile load• Application of the correct force (tensile load) is essential for areliable assembly :- under-tight fasteners can work loose.- over-tight fasteners may distort components to be connected ; ,or shear the fastener.• Tensile load depends on tightening torque applied to the fastenerand the friction coefficient.Tensile load (Fo)The force in Newtons (N) which maintains pressure contactbetween assembled components.Tightening torque (Cs)The product of a force and the leverage length at which it isapplied : Torque (N.m) = Force (in Newtons) x length (in metres).Tightening torque table :Torque values are given for 85 % fastener yield strength(documentation E 25-030).1. Friction coefficientChoose the appropriate table according to type of fasteners used (0.10,0.15, or 0.20).Example : O = 0.10.2. Fastener gradeThe grade of a fastener denotes its quality(best is 12.9).Check the appropriate column for the fasteners used.Example : fastener dia. 10, fastener grade 88 *3. Tightening torque (Cs).Torque values are listed in Newton-meters (Nm) for each type of fastener.In the example given, the fastener would be tightened to a torqueof 36 Nm.CONVERSION TABLEThe internationally accepted unit is the Newton-metre (Nm).1. To convert Nm• Newton-metres to Kilogramme-force metres : 1 Nm = 0.102 kgf.m• Newton-metres to Pound-force feet :1 Nm = 0.738 Ibf.ft• Newton-metres to Pound-force inches :1 Nm = 8.851 Ibf.in• Newton-metres to Ounce-force inches : 1 Nm = 141.61 ozf.in2. To convert kgf.m• Kilogramme-force metres to Newton-metres : 1 kgf.m =• Kilogramme-force metres to Pound-force feet : 1 kgf.m =• Kilogramme-force metres to Pound-force inches : 1 kgf.m =3. To convert Ibf.ft• Pound-force feet en Newton-metres :• Pound-force feet to Kilogramme-force metres :• Pound-force feet to Pound-force inches :4. To convert Ibf.in• Pound-force inches to Newton-metres :1 Ibf.in = 0.1129 Nm• Pound-force inches to Kilogramme-force metres : 1 Ibf.in = 0.0115 kgf.m• Pound-force inches to Pound-force feet : 1 Ibf.in =0.083 Ibf.ft• Pound-force inches to Ounce-force inches : 1 Ibf.in =16 ozf.in9.81 Nm7.23 Ibf.ft86.8 Ibf.in1 Ibf.ft = 1.35 Nm1 Ibf.ft = 0.138 kgf.m1 Ibf.ft = 12 Ibf.inISOμ = 0.10 tightening torques for phosphated or galvanised fasteners with full lubrication (μ = average friction coefficient)ISO 272Steel fastener grades to ISO 898-15,6 5,8 6,8 8,8 * 9,8 ** 10,9 12,9d mm ISO mm mm Cs Fo Cs Fo Cs Fo Cs Fo Cs Fo Cs Fo Cs Fo1,6** 0,35 3,2 0,060 260 0,084 364 0,096 416 0,128 555 0,144 624 0,189 815 0,221 9542** 0,40 4 0,126 432 0,177 604 0,202 690 0,270 921 0,303 1 036 0,396 1 352 0,463 1 5822,5** 0,45 5 0,261 718 0,365 1 006 0,417 1 150 0,556 1 533 0,626 1 724 0,82 2 251 0,96 2 6343 0,50 5,5 0,44 1 077 0,62 1 508 0,71 1 724 0,95 2 298 1,09 2 586 1,40 3 376 1,64 3 9514 0,70 7 1,03 1 868 1,44 2 615 1,65 2 988 2,20 3 985 2,49 4 484 3,23 5 853 3,78 6 8495 0,80 8 2,03 3 053 2,85 4 275 3,25 4 885 4,34 6 514 4,92 7 335 6,3 9 568 7,4 11 1966 1 10 3,53 4 310 4,95 6 034 5,6 6 896 7,5 9 195 8,53 10 336 11 13 506 12,9 15 8058 1,25 13 8,5 7 904 11,9 11 066 13,6 12 647 18,2 16 863 20,63 18 968 26 24 768 31 28 98410 1,50 16 16,8 12 580 23 17 612 27 20 128 36 26 838 41 30 197 52 39 418 61 46 12812 1,75 18 29 18 337 40 25 672 46 29 339 62 39 119 70 44 022 91 57 457 106 67 23614 2 21 46 25 175 65 35 245 74 40 280 99 53 707 111 60 251 145 78 882 170 92 30916 2 24 71 34 597 100 48 436 115 55 356 153 73 808 173 83 165 225 108 406 263 126 85818 2,5 27 99 42 094 139 58 932 159 67 351 220 92 440 313 131 897 366 154 34820 2,5 30 140 54 059 196 75 682 225 86 494 311 119 003 440 169 385 515 198 21622 2,5 34 192 67 511 269 94 515 307 108 017 424 148 374 602 211 534 704 247 54024 3 36 241 77 845 338 108 983 387 124 552 534 171 437 758 243 914 887 285 43227 3 41 355 102 393 498 143 350 569 163 829 784 225 110 1 114 320 832 1 304 375 44230 3,5 46 483 124 491 677 174 287 773 199 185 1 067 274 030 1 515 390 072 1 773 456 46733 3,5 50 653 155 083 915 217 116 1 046 248 132 1 442 341 347 2 048 485 926 2 397 568 63736 4 55 841 182 032 1 177 254 845 1 346 291 252 1 855 400 571 2 636 570 369 3 085 667 45339 4 60 1 088 218 667 1 523 306 135 1 741 349 868 2 399 481 158 3 410 685 159 3 990 801 78242** 4,5 65 1 348 250 311 1 887 350 435 2 156 400 497 2 965 550 683 4 223 784 306 4 941 917 80545** 4,5 70 1 681 292 970 2 353 410 158 2 690 468 752 3 698 644 534 5 267 917 973 6 164 1 074 22348** 5 75 2 032 329 254 2 845 460 956 3 251 526 807 4 470 724 359 6 367 1 031 663 7 450 1 207 26552** 5 80 2 608 395 006 3 651 553 008 4 172 632 009 5 737 869 013 8 171 1 237 685 9 562 1 448 35456** 5,5 85 3 255 456 159 4 557 638 622 5 208 729 854 7 161 1 003 549 10 199 1 429 298 11 935 1 672 58260** 5,5 90 4 032 532 893 5 645 746 050 6 451 852 629 8 871 1 172 365 12 634 1 669 732 14 785 1 953 94164** 6 95 4 856 602 793 6 798 843 911 7 769 964 470 10 683 1 326 146 15 215 1 888 753 17 805 2 210 243Grade 8-8a up to d=16 mm, 8-8b above d=118 mm266 www.facom.com